Synology 4 bay NAS DS420j (Diskless), 4-bay; 1GB DDR4

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Synology 4 bay NAS DS420j (Diskless), 4-bay; 1GB DDR4

4-bay home NAS with over 60 TB raw capacity support suitable for data backup and file sharing
64-bit 4-core 1 4 GHz processor and 1 GB DDR4 memory
Over 112 MB/s encrypted sequential reading and writing throughput
Easy-to-deploy surveillance solution that supports up to 16 IP cameras
Energy-saving design with only 7 88 W consumed in hibernation mode

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Synology 4 bay NAS DS420j (Diskless), 4-bay; 1GB DDR4

An essential entry-level NAS for your home

Synology 4 bay NAS DS420j

Build a private cloud for your home

Synology 4 bay NAS DS420j (Diskless), 4-bay; 1GB DDR4 NAS is designed for home data backup, file syncing, and sharing. Supporting up to 64 TB raw capacity, you can easily centralize all your multimedia collections.

CPU

CPU Model Realtek RTD1296
CPU Quantity 1
CPU Architecture 64-bit
CPU Frequency 4-core 1.4 GHz
Hardware Encryption Engine

Memory

System Memory 1 GB DDR4 non-ECC
Synology 4 bay NAS DS420j Notes Synology reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.

Storage

Drive Bays 4
Compatible Drive Type* (See all supported drives)
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
Maximum Single Volume Size* 108 TB
Hot Swappable Drive
Synology 4 bay NAS DS420j Notes “Compatible drive type” indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

External Ports

RJ-45 1GbE LAN Port 1
USB 3.2 Gen 1 Port* 2
Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

File System

Internal Drives
  • EXT4
Synology 4 bay NAS DS420j External Drives
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT

Appearance

Size (Height x Width x Depth) 184 mm x 168 mm x 230 mm
Weight 2.21 kg

Others

System Fan 80 mm x 80 mm x 2 pcs
Synology 4 bay NAS DS420j Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Low-power Mode
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level* 20.6 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 90 W
AC Input Power Voltage 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption* 21.71 W (Access)
7.88 W (HDD Hibernation)
British Thermal Unit 74.08 BTU/hr (Access)
26.89 BTU/hr (HDD Hibernation)
Synology 4 bay NAS DS420j Notes
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
  • Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%

Temperature

Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH

Certification

  • EAC
  • CCC
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM

Warranty

2 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)

Environment

RoHS Compliant

Packaging Content

  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 1
  • Quick Installation Guide X 1

Optional Accessories

Synology 4 bay NAS DS420j SM Specifications

Storage Management

Maximum Internal Volume Number 64
SSD TRIM
Synology 4 bay NAS DS420j Supported RAID Type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Synology 4 bay NAS DS420j Volume Expansion by Adding a HDD
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
Global Hot Spare Supported RAID Type
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5

File Services

File Protocol SMB/AFP/NFS/FTP/WebDAV
Maximum Concurrent SMB/AFP/FTP Connections 100
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Synology 4 bay NAS DS420j Notes The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Maximum Local User Accounts 1,024
Maximum Local Groups 256
Maximum Shared Folder 256
Maximum Shared Folder Sync Tasks 4

Log Center

Syslog Events per Second 200

General Specifications

Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Safari
Synology 4 bay NAS DS420j Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list

Synology Chat

Maximum Users 10
Notes The number of concurrent HTTP connections for Synology Chat was configured to the maximum.

Download Station

Maximum Concurrent Download Tasks 80

SAN Manager

Maximum iSCSI Target Number 10
Maximum LUN 10
Notes iSCSI Manager has been renamed to SAN Manager in DSM 7.0.

Media Server

DLNA Compliance

Synology Photos

Facial Recognition
Notes Photo Station and Synology Moments are succeeded by Synology Photos in DSM 7.0. For a features comparison, check this article.

Surveillance Station

Maximum IP cam (Licenses required) 16 (including 2 Free License) (See All Supported IP Cameras)
Synology 4 bay NAS DS420j Total FPS (H.264) 480 FPS @ 720p (1280×720)
288 FPS @ 1080p (1920×1080)
150 FPS @ 3M (2048×1536)
100 FPS @ 5M (2591×1944)
70 FPS @ 4K (3840×2160)
Total FPS (H.265) 480 FPS @ 720p (1280×720)
384 FPS @ 1080p (1920×1080)
256 FPS @ 3M (2048×1536)
160 FPS @ 5M (2591×1944)
100 FPS @ 4K (3840×2160)
Total FPS (MJPEG) 240 FPS @ 720p (1280×720)
150 FPS @ 1080p (1920×1080)
100 FPS @ 3M (2048×1536)
60 FPS @ 5M (2591×1944)
Synology 4 bay NAS DS420j Notes
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).

Synology Drive

Recommended Number of Hosted Files 500,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients 200 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Synology 4 bay NAS DS420j Notes
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • EXT4 file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Maximum Users 200
Notes
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Video Station

Video Transcoding Group 2 (See more)

VPN Server

Maximum Connections 10

Notes:

  1. Model specifications are subject to change without prior notice.
  2. The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.
  3. The actual performance may be lower than the lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.
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Synology 4 bay NAS DS420j (Diskless), 4-bay; 1GB DDR4